What did you make the frame of the grill out of? Oh wait, those are the grills in post 5... ok...

Thanks, I found some 1/8" panel board at Lowes to make the grills. I actually cut away a lot more if it than the round hole you see in the pictures. I forgot to take a picture before I added the grill cloth.

They sound a lot better than such a small driver and box has any right to.

__________________"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.

I have a pair of fr88ex in 2,5l ported tuned to 70Hz. I have tested many options but found that they sound better with the notch. I'm using 15uF, .22mH, 4.7ohm which makes a bit narrower (more Q) notch than that posted above, but it's still centered at 2700Hz.

If you use them as desktop speakers, BSC is not absolutely necessary, but I have had best results with about 2dB BSC.